The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Morteza Shamanian - One of the best experts on this subject based on the ideXlab platform.
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microstructural and weldability analysis of Inconel617 aisi 310 stainless steel dissimilar welds
International Journal of Pressure Vessels and Piping, 2016Co-Authors: Shah H Hosseini, Morteza Shamanian, Ahmad KermanpurAbstract:Abstract In this study, the microstructural evolutions and weldability of the Inconel 617/310 austenitic stainless steel dissimilar welds were investigated. Three types of filler materials including Inconel 82, Inconel 617 and 310 austenitic stainless steel were used to fabricate dissimilar joints using the gas tungsten arc welding process. Microstructural observations showed distinct cracks in the weldment produced by 310 austenitic stainless steel filler metal. The results of varestraint weldability test showed that the joints produced by Inconel 617 and 310 stainless steel filler metals exhibited the highest and lowest resistance to solidification cracking, respectively. The relatively poor cracking resistance of the welds prepared by 310 stainless steel was attributed to the wide solidification temperature range and presence of low melting point secondary phases.
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an assessment of microstructure mechanical properties and corrosion resistance of dissimilar welds between Inconel 718 and 310s austenitic stainless steel
International Journal of Pressure Vessels and Piping, 2014Co-Authors: A Mortezaie, Morteza ShamanianAbstract:Abstract In the present study, dissimilar welding between Inconel 718 nickel-base superalloy and 310S austenitic stainless steel using gas tungsten arc welding process was performed to determine the relationship between the microstructure of the welds and the resultant mechanical and corrosion properties. For this purpose, three filler metals including Inconel 625, Inconel 82 and 310 stainless steel were used. Microstructural observations showed that weld microstructures for all filler metals were fully austenitic. In tension tests, welds produced by Inconel 625 and 310 filler metals displayed the highest and the lowest ultimate tensile strength, respectively. The results of Charpy impact tests indicated that the maximum fracture energy was related to Inconel 82 weld metal. According to the potentiodynamic polarization test results, Inconel 82 exhibited the highest corrosion resistance among all tested filler metals. Finally, it was concluded that for the dissimilar welding between Inconel 718 and 310S, Inconel 82 filler metal offers the optimum properties at room temperature.
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characterization of microstructures and mechanical properties of Inconel 617 310 stainless steel dissimilar welds
Materials Characterization, 2011Co-Authors: Shah H Hosseini, Morteza Shamanian, Ahmad KermanpurAbstract:Abstract The microstructure and mechanical properties of Inconel 617/310 austenitic stainless steel dissimilar welds were investigated in this work. Three types of filler materials, Inconel 617, Inconel 82 and 310 austenitic stainless steels were used to obtain dissimilar joint using the gas tungsten arc welding process. Microstructural observations showed that there was no evidence of any possible cracking in the weldments achieved by the nickel-base filler materials. The welds produced by 617 and 310 filler materials displayed the highest and the lowest ultimate tensile strength and total elongation, respectively. The impact test results indicated that all specimens exhibited ductile fracture. Among the fillers, Inconel 617 exhibited superlative fracture toughness (205 J). The mechanical properties of the Inconel 617 filler material were much better than those of other fillers.
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dissimilar welding of aisi 310 austenitic stainless steel to nickel based alloy Inconel 657
Journal of Materials Processing Technology, 2009Co-Authors: H Naffakh, Morteza Shamanian, F AshrafizadehAbstract:Abstract The current work was carried out to characterize welding of AISI 310 austenitic stainless steel to Inconel 657 nickel–chromium superalloy. The welds were produced using four types of filler materials; the nickel-based corresponding to Inconel 82, Inconel A, Inconel 617 and 310 austenitic stainless steels. This paper describes the selection of welding consumables for the joint. The comparative evaluation was based on hot-cracking tests (Varestraint test) and estimation of mechanical properties. According to Varestraint tests, Inconel A showed the least susceptibility to hot cracking. In tension tests, all weldments failed in the weaker parent metals (i.e., Inconel 657). Moreover, Inconel A weldment had the highest strength and total elongation. On the other hand, the weld metals failed by ductile fracture except Inconel 617, which exhibited mixed fracture mode. At last, it was concluded that Inconel A filler material offered the best compromise for the joint between Inconel 657 and 310 stainless steel.
B Zhang - One of the best experts on this subject based on the ideXlab platform.
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Comparison of carbon-based reinforcement on laser aided additive manufacturing Inconel 625 composites
Applied Surface Science, 2019Co-Authors: B Zhang, Guijun Bi, Youxiang Chew, Guangyi Ma, Yongfeng Liu, Pei Wang, Seung Ki MoonAbstract:Abstract In this paper, a comparison study of CNTs and graphite addition in laser aided additive manufacturing (LAAM) Inconel 625 composites was proposed. The difference of microstructure and tensile properties between two modified Inconel 625 alloys was investigated. SEM, EDS and micro-Raman identification results showed that the CNTs structure can be found on columnar dendrite boundaries accompanied with precipitated Laves and γ′ phase in LAAM Inconel 625-CNTs composite. Based on tensile test results, 0.25 wt% of CNTs addition in LAAM Inconel 625 can significantly increase strength and ductility by 20% because of grain refinement and grain boundary pinning reinforcement. However, the graphite addition only raises strength but decreases ductility due to carbon content raise.
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microhardness and microstructure evolution of tib2 reinforced Inconel 625 tib2 composite produced by selective laser melting
Optics and Laser Technology, 2016Co-Authors: B Zhang, Guijun BiAbstract:Abstract In this study, micron-size TiB 2 particles were utilized to reinforce Inconel 625 produced by selective laser melting. Exceptional microhardness 600–700 HV 0.3 of the composite was obtained. In further investigation, the microstructure and mechanical properties of Inconel 625/TiB 2 composite can be significantly influenced by addition of TiB 2 particles during SLM. It was found that the long directional columnar grains observed from SLM-processed Inconel 625 were totally changed to fine dendritic matrix due to the addition of TiB 2 particles. Moreover, with laser energy density (LED) of 1200 J/m, a Ti, Mo rich interface around TiB 2 particles with fine thickness can be observed by FESEM and EDS. The microstructure evolution can be determined by different laser energy density (LED): under 1200 J/m, γ phase in dendrite grains; under 600 J/m, γ phase in combination of dendritic and acicular grains; under 400 J/m, γ phase acicular grains. Under optimized LED 1200 J/m, the dynamic nanohardness (8.62 GPa) and elastic modulus (167 GPa) of SLM-processed Inconel 625/TiB 2 composite are higher compared with those of SLM-processed Inconel 625 (3.97 GPa and 135 GPa, respectively).
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Microstructural characteristics and mechanical properties of carbon nanotube reinforced Inconel 625 parts fabricated by selective laser melting
Materials and Design, 2016Co-Authors: Pan Wang, C N Sun, Y F Lim, C C Tan, Srinivasan Raghavan, J. Wei, B Zhang, Pei Wang, D. ChiAbstract:© 2016 Elsevier LtdSelective laser melting (SLM) was used for additive manufacturing multi-wall carbon nanotube (MWCNT) reinforced Inconel 625 composites. The MWCNTs were coated on Inconel 625 powder through molecular-level mixing. Compared to the SLM fabricated Inconel 625 sample, the composite sample showed significant improvement in ultimate tensile and yield strength with less elongation. Heat-treatment on the composite sample recovered its elongation to the level of pure Inconel 625 while maintaining its ultimate tensile strength but reducing its yield strength. The microstructures of the composite sample had a slightly faster cooling rate than the pure metallic sample during SLM fabrication. The electron backscatter diffraction graphs revealed the grain refinement induced by MWCNTS in the alloy matrix. The Raman spectra and TEM micrographs revealed the presence of MWCNT in the metal matrix after SLM fabrication.
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Microstructure and mechanical properties of Inconel 625/nano-TiB2 composite fabricated by LAAM
Materials & Design, 2016Co-Authors: B Zhang, Guijun Bi, Youxiang Chew, Jiaming Bai, Pei Wang, Mui Ling Sharon NaiAbstract:Laser aided additive manufacturing (LAAM) was applied to produce nano-TiB2 particle reinforced Inconel 625 composite material. The influence of nano-TiB2 addition on the microstructure, micro-hardness, wear performance and mechanical properties of the composite was studied. The XRD and SEM analyses verified that the LAAM processed Inconel 625/nano-TiB2 composite consisted of single long columnar grain along building direction with TiB2 particles concentration at grain boundaries. The mechanical testing revealed that the LAAM processed Inconel 625/nano-TiB2 composite possessed excellent tensile properties (σUTS≈1020MPa, σ0.2YS≈714MPa, δ≈19%) with relatively high micro-hardness (HV0.2=347) and good abrasive resistance (COF≈0.39).
Myles Fullen - One of the best experts on this subject based on the ideXlab platform.
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Effect of heat treatment variations on the mechanical properties of Inconel 718 selective laser melted specimens
Additive Manufacturing, 2018Co-Authors: Judy Schneider, Benjamin Lund, Myles FullenAbstract:The wide usage of Inconel 718 alloy is based on its fusion weldability and its availability in many different forms including cast, wrought and powder. Thus with the emergence of additive manufacturing (AM) techniques for metals, Inconel 718 is a prime candidate for materials to be considered. Powders that have been developed for powder metallurgy are readily available for use in various AM processes such as selected laser melting (SLM) powder bed. While much research has focused on optimizing the deposition parameters to achieve fully densified specimens, subsequent heat treatments and their effect on the microstructure also need to be understood. This study evaluated the microstructure of SLM specimens of Inconel 718 after various heat treatments and compared the resulting effect on the quasi-static mechanical properties.
Pei Wang - One of the best experts on this subject based on the ideXlab platform.
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Comparison of carbon-based reinforcement on laser aided additive manufacturing Inconel 625 composites
Applied Surface Science, 2019Co-Authors: B Zhang, Guijun Bi, Youxiang Chew, Guangyi Ma, Yongfeng Liu, Pei Wang, Seung Ki MoonAbstract:Abstract In this paper, a comparison study of CNTs and graphite addition in laser aided additive manufacturing (LAAM) Inconel 625 composites was proposed. The difference of microstructure and tensile properties between two modified Inconel 625 alloys was investigated. SEM, EDS and micro-Raman identification results showed that the CNTs structure can be found on columnar dendrite boundaries accompanied with precipitated Laves and γ′ phase in LAAM Inconel 625-CNTs composite. Based on tensile test results, 0.25 wt% of CNTs addition in LAAM Inconel 625 can significantly increase strength and ductility by 20% because of grain refinement and grain boundary pinning reinforcement. However, the graphite addition only raises strength but decreases ductility due to carbon content raise.
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Microstructural characteristics and mechanical properties of carbon nanotube reinforced Inconel 625 parts fabricated by selective laser melting
Materials and Design, 2016Co-Authors: Pan Wang, C N Sun, Y F Lim, C C Tan, Srinivasan Raghavan, J. Wei, B Zhang, Pei Wang, D. ChiAbstract:© 2016 Elsevier LtdSelective laser melting (SLM) was used for additive manufacturing multi-wall carbon nanotube (MWCNT) reinforced Inconel 625 composites. The MWCNTs were coated on Inconel 625 powder through molecular-level mixing. Compared to the SLM fabricated Inconel 625 sample, the composite sample showed significant improvement in ultimate tensile and yield strength with less elongation. Heat-treatment on the composite sample recovered its elongation to the level of pure Inconel 625 while maintaining its ultimate tensile strength but reducing its yield strength. The microstructures of the composite sample had a slightly faster cooling rate than the pure metallic sample during SLM fabrication. The electron backscatter diffraction graphs revealed the grain refinement induced by MWCNTS in the alloy matrix. The Raman spectra and TEM micrographs revealed the presence of MWCNT in the metal matrix after SLM fabrication.
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Microstructure and mechanical properties of Inconel 625/nano-TiB2 composite fabricated by LAAM
Materials & Design, 2016Co-Authors: B Zhang, Guijun Bi, Youxiang Chew, Jiaming Bai, Pei Wang, Mui Ling Sharon NaiAbstract:Laser aided additive manufacturing (LAAM) was applied to produce nano-TiB2 particle reinforced Inconel 625 composite material. The influence of nano-TiB2 addition on the microstructure, micro-hardness, wear performance and mechanical properties of the composite was studied. The XRD and SEM analyses verified that the LAAM processed Inconel 625/nano-TiB2 composite consisted of single long columnar grain along building direction with TiB2 particles concentration at grain boundaries. The mechanical testing revealed that the LAAM processed Inconel 625/nano-TiB2 composite possessed excellent tensile properties (σUTS≈1020MPa, σ0.2YS≈714MPa, δ≈19%) with relatively high micro-hardness (HV0.2=347) and good abrasive resistance (COF≈0.39).
Judy Schneider - One of the best experts on this subject based on the ideXlab platform.
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Effect of heat treatment variations on the mechanical properties of Inconel 718 selective laser melted specimens
Additive Manufacturing, 2018Co-Authors: Judy Schneider, Benjamin Lund, Myles FullenAbstract:The wide usage of Inconel 718 alloy is based on its fusion weldability and its availability in many different forms including cast, wrought and powder. Thus with the emergence of additive manufacturing (AM) techniques for metals, Inconel 718 is a prime candidate for materials to be considered. Powders that have been developed for powder metallurgy are readily available for use in various AM processes such as selected laser melting (SLM) powder bed. While much research has focused on optimizing the deposition parameters to achieve fully densified specimens, subsequent heat treatments and their effect on the microstructure also need to be understood. This study evaluated the microstructure of SLM specimens of Inconel 718 after various heat treatments and compared the resulting effect on the quasi-static mechanical properties.
